| Sign | |
| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 17121-17121 | |
| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 17119-17119 | 子類 Sign and ContentBearingObject |
| No TPTP formula. May not be expressible in strict first order. | Media.kif 851-851 | 子類 Sign and DataDisplayDevice |
| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 17120-17120 | 子類 Sign and 顯示神器 |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 17122-17122 |
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